Dozer with no bind tilt linkage

ABSTRACT

Compensating linkage for a tilt dozer including a transversely extending link pivotally connected at one end to the rear of the moldboard on a vertical axis and pivotally connected at its other end to diagonal braces from the two dozer push arms.

United States Patent 1 1 3,743,032 Schick July 3, 1973 DOZER WITH NOBIND TILT LINKAGE 3.025.620 3/1962 Liess 172/803 3,l87,448 6 1965 K I'I72 803 [751 Frederick Schick spmgfield- 3,o49,s20 8/1962 172/803 3Assignee: m c Manufacturing 3,656,558 l0/l970 Kollnger 172/803 Company,Milwaukee, Wis.

[ Filed: June 14, 1 Primary ExaminerRobert E. Pulfrey AssistantExaminer-Ste hen C. Pelle rino 21 A 1.N .1266510 P 8 1 ppAttorney-Charles L. Schwab Related US. Application Data [63]Continuation of Ser No. 45,730, June 12, I970,

abandoned.

[57] ABSTRACT [52] US. Cl. 172/803, 172/460 [51] Int. Cl. A02f 3/76Compensating linkage for a tilt dozer including a trans- Field of Search80 versely extending link pivotally connected at one end 172/806, 801 tothe rear of the moldboard on a vertical axis and pivotally connected atits other end to diagonal braces [56] References Cited from the twodozer push arms.

UNITED STATES PATENTS 3,503,457 3/1970 Smith et al 172/803 3 Claims, 3Drawing Figures PAIENTEU I973 SHEEI 2 N 2 JQIX/B PMM DOZER WITH NO BINDTILT LINKAGE This is a continuation of application Ser. No. 45,730, nowabandoned, filed June 12, 1970.

This invention relates to an improved compensating mechanism for a tiltdozer and particularly to the provision of a transversely extending linkinterconnecting the rear of the moldboard and a pair of diagonal braces.

Heretofore others have proposed compensating mechanisms for tilt dozers,such as shown in US. Pat. Nos. 3,025,620; 3,049,820; 3,049,821 and3,395,764. Such designs have not proven entirely satisfactory from thestandpoint of cost, function and service.

It is an object of the present invention to provide an improved dozertilt compensating mechanism which is simple in design, is low in costand gives long troublefree service.

It is a further object of this invention to provide a dozer tiltcompensating mechanism wherein the diagonal braces extending inwardlyand forwardly from the push arms are connected to the moldboard by asingle link pivoted to the moldboard on a vertical pivot axis.

It is a further object of this invention to provide a dozer tiltcompensation linkage of the type described in the previous objectwherein the diagonal braces are pivotally connected to the link atvertically spaced points, respectively.

These and other objects and advantages of the present invention will beapparent when the following description is read in conjunction with thedrawings, in which:

FIG. 1 is a partial side view of a tractor with a tilt dozer in whichthe present invention is incorporated;

FIG. 2 is a top view of the tractor and dozer of FIG. 1; and

FIG. 3 is a section view taken on line III-III in FIG. 1.

Referring to FIGS. 1 and 2, push arms 11, 12 of a dozer 13 are connectedon a transverse axis 14 to track frames of a crawler tractor 16 by balland socket joints 17, 18. The front end of the push arms 11, 12 areconnected to transversely spaced points of the lower rear of a moldboard21 of the dozer 13 by spherical pivot connections 22, 23. Tilting of themoldboard is controlled by an extensible and contractible tilt brace inthe form of a double-acting hydraulic jack 26, a rod 27 of which ispivotally connected to the upper rear of the moldboard by ball andsocket connection 28 and a cylinder 29 of which is pivotally connectedto the push arm 11 by a pin 31. At the opposite lateral side of thedozer 13, an upwardly extending tilt brace 32 has its opposite endspivotally connected to the push arm 12 and upper rear of the moldboard21.

The dozer is raised and lowered, about the transverse axis 14, bycontraction and expansion of a pair of double-acting jacks 33, 34 havingtheir rods, 36, 37 pivotally connected to brackets at the rear of themoldboard 21 and their cylinders 38, 39 pivotally connected to thetractor 16. As customary, the hydraulic control for the jacks 33, 34includes means (not shown) for hydraulically interconnectingcorresponding ends of the cylinders 38, 39.

Lateral stability for the dozer is provided by diagonal brace structuresin the form of diagonal braces 41, 42 which are pivotally connected tothe push arms 11, 12 by ball and socket joints 43, 44 and extendforwardly and inwardly to the central rear of the moldboard 21.

In order to interconnect the inner ends of braces 41, 42 and themoldboard 21 to provide lateral rigidity to the dozer and still allowrelative longitudinal movement between the moldboard and the inner endsof the braces 41, 42, a transverse link 46 is provided at the centralrear of the moldboard. As also shown in FIG. 3, the link 46 is pivotallyconnected at one end on a vertical pivot axis 47 to vertically spacedbrackets 48, 49 by a pin 51. The braces 41, 42 are universally connectedto the link 46 by universal pivots in the form of ball and socket joints52, 53 which are in vertically spaced relation to one another and lie inthe central vertical longitudinal plane of the dozer. As shown in FIG.3, ball-shaped ends 54, 56 on the braces 41, 42 are releasably securedto link 46 by caps 57, 58 fastened to the link 46 by cap screws 59.

OPERATION When the tilt brace jack 26 is expanded, the lateral end ofthe moldboard 21 to which the jack 26 is connected will rise relative toits other lateral end. This will cause the pivot joints 43, 44 to movetoward one another, thus causing inner ends of braces 41, 42 to movecloser to the rear of the moldboard. Transverse link 46 permits thiswhile still providing a connection between the braces 41, 42 and themoldboard to provide lateral stability for the moldboard. By pivotallyconnecting the link 46 to the rear of the moldboard on a vertical axis,the inner ends of the braces 41, 42 are supported in the desiredvertical position so they perform the desired diagonal bracing function.If the tilt jack 26 is contracted the adjacent moldboard end will belowered and once again the inner ends of braces 41, 42 will move closerto the moldboard 21. Thus the transversely extending link 46 with itstransversely spaced pivot connections with the braces and moldboardcompensates for dimensional changes occurring during tilting of thedozer.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. In combination with a dozer having a pair of longitudinally extendingand laterally spaced push arms pivotally connected at their front endsto the rear of a moldboard and a pair of tilt braces extending upwardlybetween the top of the push arms and the blade, at least one of the tiltbraces being extensible to tilt the moldboard, a tilt compensatingarrangement comprising:

a pair of diagonal braces connected to and extending laterally inwardlyfrom said push arms toward one another with their inner ends terminatingadjacent the central rear of said moldboard and a transversely extendinglink pivotally connected at one transverse end to said moldboard on avertical pivot axis and pivotally connected at its other transverse endto said inner ends of said braces, said inner ends of said braces andsaid other end of said link swinging horizontally about said verticalpivot axis when said moldboard is tilted.

2. The invention of claim 1 wherein said link is pivotally connected tosaid braces at approximately the central vertical longitudinal plane ofthe dozer.

3. The invention of claim 2 wherein said pivot connnections between saidlink and said braces are vertically spaced one above the other.

III =l= l

1. In combination with a dozer having a pair of longitudinally extendingand laterally spaced push arms pivotally connected at their front endsto the rear of a moldboard and a pair of tilt braces extending upwardlybetween the top of the push arms and the blade, at least one of the tiltbraces being extensible to tilt the moldboard, a tilt compensatingarrangement comprising: a pair of diagonal braces connected to andextending laterally inwardly from said push arms toward one another withtheir inner ends terminating adjacent the central rear of said moldboardand a transversely extending link pivotally connected at one transverseend to said moldboard on a vertical pivot axis and pivotally connectedat its other transverse end to said inner ends of said braces, saidinner ends of said braces and said other end of said link swinginghorizontally about said vertical pivot axis when said moldboard istilted.
 2. The invention of claim 1 wherein said link is pivotallyconnected to said braces at approximately the central verticallongitudinal plane of the dozer.
 3. The invention of claim 2 whereinsaid pivot connections between said link and said braces are verticallyspaced one above the other.